Beacon Villager 4/4/12: Controlling invasive species in rivers . Thanks to a $70,000 grant from the National Fish and Wildlife Foundation, towns along the Sudbury, Assabet, and Concord (SuAsCo) rivers can begin to control invasive plant species that threaten this important and ecologically rich watershed. The grant will support the work of the Sudbury-Assabet-Concord Cooperative Invasive Species Management Area (CISMA), a regional collaboration of federal, state, nonprofit, and municipal organizations formed to manage invasive species in the watershed.